Brocker says rule No. 1 when is something a lot of people forget to consider: Make sure you have enough space for the tree.

"You don't want it to be hitting the ceiling," he said. "That's going to make it tough to get it in and move it around. So basically, give it 6 inches to a foot clearance from the ceiling."

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While on the lot, he advises, buyers should make sure the tree is healthy and will not turn brown before the holidays are over.

"You can always shake it out, see how many dead needles fall out, but for the most part, all of these trees hold well past Christmas, as long as you keep them watered," he said. "Watch it for the first week. Give it some water after a day or two, see how much it drinks. And typically they'll drink a gallon to two gallons a week."

Ryan says after the holiday, too often people leave their trees on the curb for the trash collectors to pick up. He recommends being a little more ecologically friendly.

"If you know anybody who works with wood or works with trees, you could salvage them and make them into art projects, things like that," he said.

Brocker added, there are also recycling services you can call to come pick up that tree.